The 18-year-old is suspected of murder and several attempted murders following the attack at Brinell School in Fagersta in August, when a 17-year-old girl was killed and three boys were injured.
The Probation Service, part of the Swedish Prison and Probation Service, has now conducted a so-called risk and needs assessment. According to the assessment, which Expressen previously reported on, the 18-year-old needs supervision.
"He has no physical illness, but has described a mental illness of an extensive nature," the Probation Service writes, recommending that another so-called Section 7 examination be conducted.
According to a similar examination conducted earlier last fall, the 18-year-old may be suffering from a serious mental disorder.
In addition to the 18-year-old suspect, a 16-year-old boy is being held on suspicion of aiding and abetting the crimes.
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